Revert "modify rakefile and new test post"

This reverts commit 00daf903d4a068dcd58e6e21ee289ec6115c3212.
Revert "Revert "modify rakefile and new test post""

This reverts commit 102c33b242f6cf661d392d80cac72283d0705e22.
Revert "remove hello world"

This reverts commit 282e9cb8ae9fd098edf3dc8ffa58960ab526511c.
new post